Spindle for milling-machines.



J. L. WHEELER.

SPINDLE FOR MILLING MACHINES.

APPLICATION HLED OCT. 22. I914.

Patented Sept. 11, 1917.

have invented new and useful and the like,

UNITED STATES PATENT OFFICE.

JOHN L. WHEELER, 01'

5'1. LOUIS, MISSOURI.

SPIHIDLE FOB MILLING-MAGEN- Application filed October 22,

To all whom it ma concern:

Be it known diet I, JOHN L. WHEELER,

a citizen of the United States, ,residing in the city of St. Louis andState of Missouri, Improvements in Sfpindles for Milling-Machines, ofwhich the ollowing is a s ification.

This invention relies to milling machines and has more particularly todo with the spindle construction. It has for its objects to produce asimple and efiicient construction and arrangement whereby accuracy andrecision in the work may be accomplished, and which will obviate thedisadvanta es incidental to devices of this character ue to thenecessarily fine adjustment and consequent heating of the spindle inuse.

The invention consists in the parts and in e arrangements andcombinations of parts hereinafter described and claimed.

In the accompan i drawing,

Figure 1 is a si e e evation of a machine constructed according to theinvention; and

Fi 2 is a detail view of a portion of the spind le.

v The machine illustrated in the drawing comprises a hollow column orstandard 1 which extends up from a base 2. On the lower front portion ofthe column is a guide plate 3 whose opposite side mar 'nal portionsextend be end the sides of t e column and arebeveled to corres 0nd tothe sides of groove (not own) in the rear ortion 4 of avertically-adjustable tableracket 5. This table-brac at is supported,raised and lowered in the usual manner by 'a screw 6, which is swiveledor otherwise suitably engaged at its 11 per end to the table-bracket andworks t rough a screwthreaded opening in the top of a hollow ped estal 7extending u from the base 2; the screw bein rotated y suitable gearingnot shown) w ich is controlled by a hen e 8 at the side of thetable-bracket.

Mounted slidably on the table-bracket 5 so as to 'be moved horizontallytoward and awa from the column 1 is a table-carria e 9 w ich is actuatedin the usual manner fluitable gearing (not shown) and is controlled by amanipulating handle 10 at the front of the table-bracket. The work-tableproper 11 is mounted slidablly on the tablecarriage 9 so as to travelorizontallg at right angles to the direction of travel 0 the a dovetailSpecification 01' {letters Patent.

Patented Sept. 11, 1917. 1914. SerialNo. cameo.

latter; said work-table being provided with the usual undercut roove orooves 12 in its top face in whic the wor -holding devices are secured,and being actuated by suitable gearing (not shown) and controlled by amanipulating handle 13 at either end.

ding horizontally through the column 1 is a spindle 14 having the usualtapered socket 15 for the s ank 16 of an arbor or mandrel 17 on whichthe milling cutters 18 are fastened in the usual manner. spindle isprovided with a small axial bore 14 through which a rod may be insertedto force the arbor when it is desired to remove it from the socket. Asshown more clearly in Fig. 2, the journal portion 19 of the spindle istapered to correspond to the taper of the 'bore of the bearing portion20 of the column 1. On the socket end of the spindle are two jam nuts 21which constitute an adjustable thrust collar adapted to work against abearing face 22 on the front side 0 the column 1, while two nuts 28 areprovided on the spindle near the op osite side of the column for takingthe en thrust of the spindle in the opposite direction. Feather-keyed onthe spindle, next to a bearing face 24 on the rear side of the column 1,is a ring 25; and interposed be tween said rin and the jam nuts 23 isanother ring 26 w ich isprovided with springpressed pins 27 arranged andadapted to enter recesses provided therefor in the adjacent face of saidfirst mentioneo ring 25.

In adjustin the s indleto the bearing 20 the thrust co lar 2 ispositioned on the spindle so as to just come snugly against the andbearing face 22 when the tehpered journal portion 19 of the spindle-istted to the bore of the bearing 20. The collar 23 is then adjusted to aposition on the spindle so that there is sli ht end play between. therin 25 and 26w ich are interposed between said collar 23 and the endbearing face 24 of the column 1.

The, interposition of the ring 26 with its sprin -pressed pins 27between the T111 25 and t e thrustcollar 28 afi'ords a resi lent forceto constantly hold the spindle with its tapered journal portion wellintoits bearing and the'thrust collar 21 snu 1y against the bearing face 22,thespnings g of suflicient strength to prevent 'endwiselreciprocation ofthe spindle which might occur owing.

to .end play tween the thrust collars either thereby insuri in theadjustment or resultinglfro'm expansion of the spindle due to the eatingthereof. Said s rings also overcome the and pull of the mi ing cutterson the spindle, yet they yield to the contraction of the spindle due toatmospheric changes or cooling 0 the s indle when runmn at slower speedsan t ereby revent'bindm and sticking of the spindle etween the t rustcollars. Obviously, therefore, the spindle rotates in its bearingwithout chattering or and motion,

accuracy and precision in the operation 0 milling.

The spindle 14 is journaled at its end oposite to the socket end in abearing 28 provided therefor in a edestal frame or post 29, and on thespin 1c is a stepped pu ley 30, while near the base of the machine is adriving shaft 31 which is journaled at one end in a bracket bearing 32projecting from the rear side of the column 1 and at its opposite end ina bearing 33 provided thenefor on the 0st 29. The drivin shaft is alsoprovide with a stepped pu ley 34, in reverse relation to the pulley 30on the spindle 14, so that different speeds may be imparted to thespindle at will. A support for the outer end of the arbor 17 is obtainedby providing a horizontal arm 35 at the front of detachably mounting adepending end thereof, means, and with a centering pin 38 arranged andadapted to enter an axial recess in the end 9f the arbor. To afiord alock for the centering pin the bearing throughwhich it works is lit anda clamping screw 39 is provided to tighten the hearin about the pinafter adiustme' nt is efiecte claim:

1. In a milling machine or the like, a taper-bored bearing having endthrust shoulders at opposite ends thereof, a spindle having acounterpart tapered portion journaled in said bearin an adjustableshoulder on said spindle a acent to the lar r end of its journal portionand cofiperatmg with the end thrust shoulder at the corresponding end ofthe bearing for taking the thrust an limiting the endwise movement ofthe spindle'in one direction, an adjustable shoulder on said spindleadjacent to the smaller end of its gournal risen and coiiperating withthrust shoulder at the correspondm end of the bearin and aspring-pressed device interposed tween sald two lastmentioned shoulders,whereby the spindle-is yieldably held with its first-mentioned shoulderagainst the and thrust shoulder at the ad'acent end of the bearing.

In a millin machine or the like, a taper-bored bearin a spindld having acounte art tape journal portion fitted to said ring, an and thrustshoulder on as by free movement endwise providing said bracket membersaid hearing at the smaller end of the.bore thereof, a thrust shoulderon said spindle op osed to said first mentioned shoulder, and resilientmeans interposed between and acting a inst said two thrust shoulders.

3. n a milling machine or the like, a bearing, a spindle ournaled insaid bearing, a co lar on said spindle abutting the on of said bearingfor takingthe end thrust and limiting the endwise movement of thespindle in one direction, a ring mounted on said spindle so as to rotatetherewith but having thereon, said ring normally abutting the oppositeend of the bearing, a thrust collar on said spindle adjacent to saidring, and resilient means on said spindle interposed between and actinagainst said last-mentioned thrust collar an said so as to hold thelatter against the end of t e bearing and the spindle yieldably with itsfirst-mentioned thrust collar against the o posite end of the bearing.

4. n a milling machine or the like, a bearing,said bearing havin thrustfaces at its opposite ends, a inde journaled in said bearing, a thrustcoar on said s indleadapted to erate with the end 0 the bearing to limit te endwise movement of the spindle in one direction, a ring mounted onsaid spindle adjacent to the opposite end of said bearing, said ringhaving recesses in its outer face and being engaged to said spindle soas to rotate therewith, but being permitted to move separately endwisethereon, a thrust collar on said spindle ad'acent to said ring, a secondring interpose between said mentioned. ring and said adjacent thrustcollar, said second mentioned ring having spring, pins projecting fromits inner face an adapted to engage in the respective recesses in saidfirst mentioned ring, whereby the two rings are held from separaterotation and the spindle is pressed in the direction limited by saidfirst mentioned thrust collar.

5. In a milling machine or the like, a thrust faces at taper-boredbearing havin spindle aving a ta. are

its opposite ends, a d journal portion in said bearing an a justablethrust collar on said spin e adjacent to the larger end of the taperedjournal portion thereof and in opposed relation to the thrust face atthe co ending and of said bearing, a collar on sai spindle adjacent tothe smaller end of the ta ered journal ortion thereof, said secon-ment1oned co ar bein capable of endwise movement on sai fixed to rotatetherewith and being'in opposite relation to the thrust face at thecorresponding end of said bearing, said collar havin recesses in itsouter face, an adjustable t rust collar on saidspindle beyond saidsecond-mentioned collar, and another collar mounted loosely on saidspindle between said last-mentioned thrust collar and saidsecond-mentioned collar, said loose my hand in presence of twosubscribing witcollar bearing with its outer face against nesses.

said last-mentioned thrust collar and having ipring-pressed pinsprojecting from its inner JOHN WHEELER ace and bearing in the recessesof said sec- Witn:

end-mentioned collar. G. A. PENNINGTON,

In testimony whereof, I have hereunto set STELLA HILL.

